Which internal event signaled the end of the soviet union?

The superpower of the socialist bloc, collapsed economically and territorially due to the reforms (Perestroika) carried out by Mikhail Gorbachev in view of the economic collapse of the Soviet Union and the Soviet republics began to seek their independence.

Explanation:

The independence of the fifteen Republics of the Soviet Union happened between March 11, 1990 and December 25, 1991, with the signing of the Treaty of Belavezha signed on December 8, 1991 by the presidents of the RSFS of Russia, RSS of Ukraine and RSS of Belarus declare the official dissolution of the USSR. States were then established in the former Republics of the Soviet Union. The dissolution of the largest socialist state in the world also marked the end of the Cold War.

they have different colored collars

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".